How many miligrams of caffeine in a cup of coffee?!
How many miligrams of caffeine in a cup of coffee?
Answers: 16 oz of regular brewed coffee has 270 mg (same for a Grande Starbucks coffee). Espresso has a lot less- 30-50 mg oer ounce.
http://www.mayoclinic.com/health/caffein... IIRC, 135mg w/v.
That's for normal regular coffee. The instant kind. Depends on the brand and the amount of coffee used to make it Since we cant answer your question without knowing what coffee and how big a cup read this extract from first result of an internet search on "coffee cafine" and decide for yourself
The Chemistry of Caffeine and related products
1. How much caffeine is there in [drink/food/pill]?
According to the National Soft Drink Association, the following
is the caffeine content in mgs per 12 oz can of soda:
Afri-Cola 100.0 (?)
Jolt 71.2
Sugar-Free Mr. Pibb 58.8
Mountain Dew 55.0 (no caffeine in Canada)
Diet Mountain Dew 55.0
Kick citrus 54 (36mg per 8oz can, caffeine from guarana)
Mello Yellow 52.8
Surge 51.0
Tab 46.8
Battery energy drink -- 140mg/l = 46.7mg/can
Coca-Cola 45.6
Diet Cola 45.6
Shasta Cola 44.4
Shasta Cherry Cola 44.4
Shasta Diet Cola 44.4
Mr. Pibb 40.8
OK Soda 40.5
Dr. Pepper 39.6
Pepsi Cola 37.2
Aspen 36.0
Diet Pepsi 35.4
RC Cola 36.0
Diet RC 36.0
Diet Rite 36.0
Canada Dry Cola 30.0
Canada Dry Diet Cola 1.2
7 Up 0
Krank2o sample 1 97.7mg/500ml sample 2 101.6mg/500ml
Lab: Ameritech Labs, College Pt, NY; tested Sep 03, 96
Krank2o middle 96.4mg/500ml
Lab: Ameritech Labs, tested Aug 29, 96
By means of comparison, a 7 oz cup of coffee has the following
caffeine (mg) amounts, according to Bunker and McWilliams in J.
Am. Diet. 74:28-32, 1979:
Drip 115-175
Espresso 100mg of caffeine
1 serving (1.5-2oz)
Brewed 80-135
Instant 65-100
Decaf, brewed 3-4
Decaf, instant 2-3
Tea, iced (12 ozs.) 70
Tea, brewed, imported 60
Tea, brewed, U.S. 40
Tea, instant 30
Mate 25-150mg
The variability in the amount of caffeine in a cup of coffee or
tea is relatively large even if prepared by the same person using
the same equipment and ingredients day after day.
Reference Variability in caffeine consumption from coffee and
tea: Possible significance for epidemiological studies by B.
Stavric, R. Klassen, B. Watkinson, K. Karpinski, R. Stapley, and
P. Fried in "Foundations of Chemical Toxicology", Volume 26,
number 2, pp. 111-118, 1988 and an easy to read overview, Looking
for the Perfect Brew by S. Eisenberg, "Science News", Volume 133,
April 16, 1988, pp. 252-253.
Quote from the lab manual:
Caffeine is present in tea leaves and in coffee to the
extent of about 4%. Tea also contains two other
alkaloids, theobromine and theophylline. These last two
relax the smooth muscles where caffeine stimulates the
heart and respiratory systems.
The effects of theobromine are, compared to caffeine and
theophylline, relatively moderate. However, cocoa contains eight
times more theophylline than caffeine. As well, caffeine has been
shown to combine with other substances for added potency. Thus
the effects of theobromine might be enhanced by the caffeine in
chocolate.
Theobromine is highly toxic to dogs and kills many canids/year
via chocolate poisoning. It takes quite a dose to reach fatal
levels (more than 200 mg/kg bodyweight) but some dogs have a bad
habit of eating out of garbage cans and some owners have a bad
habit of feeding dogs candy. A few oreos won't hurt a dog, but a
pound of chocolate can do considerable damage.
Clinical signs of theobromine toxicity in canids usually manifest
8 hours after ingestion and can include: thirst, vomiting,
diarrhea, urinary incontinence, nervousness, clonic muscle
spasms, seizures and coma. Any dog thought to have ingested a
large quantity of chocolate should be brought to an emergency
clinic asap, where treatment usually includes the use of emetics
and activated charcoal. The dog will thus need to be monitored to
maintain proper fluid and electrolyte balance.
Pathogenesis of theobromine toxicity: evidently large quantities
of theobromine have a diuretic effect, relax smooth muscles, and
stimulate the heart and cns.
Reference:
Fraser, Clarence M., et al, eds. The Merck Veterinary Manual, 7th
ed. Rahway, NJ: Merck & Co., Inc. 1991. pp. 1643-44.
On humans caffeine acts particularly on the brain and skeletal
muscles while theophylline targets heart, bronchia, and kidneys.
Other data on caffeine:
Cup of coffee 90-150mg
Instant coffee 60-80mg
Tea 30-70mg
Mate 25-150mg
Cola 30-45mg
Chocolate bar 30mg
Stay-awake pill 100mg
Vivarin 200mg
Cold relief tablet 30mg 2.56 million